Move skip_contiguous_flags, max_contiguous_flags, skip_if_flag_within_wedge_distance from hera_cal.vis_clean.fourier_filter into uvtools.dspec.fourier_filter

[aewallwi]

A number of functions now exist in hera_cal.vis_clean.fourier_filter to deal with real-world non-idealities in flagging that can confound the linear filtering methods called by uvtools.dspec.fourier_filter. hera_cal.vis_clean.fourier_filter was intended to be a shallow wrapper of uvtools.dspec.fourier_filter and these settings are useful for analysis that relies on uvtools.dspec.fourier_filter but that do not need all the other functionality in hera_cal. I think it would make sense for us to move these functions.